Qaisar, M.A., Kareem Akhter, Feroz Shah, Muhammad Sadiq, Shaukat Ali Shah, and Muhammad Naeem Khan. 2017. “Experimental and Numerical Analysis of Single Air-Bubble Rise in Vertical Water Channel Using a Needle”. Journal of the Pakistan Institute of Chemical Engineers 45 (1):JPIChE 45 (1) 2017 90-99. http://piche.org.pk/journal/index.php/jpiche/article/view/350.